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Occurrence and Sequence Analysis of Porcine Deltacoronaviruses In Zhai et al. Virology Journal (2016) 13:136 DOI 10.1186/s12985-016-0591-6 RESEARCH Open Access Occurrence and sequence analysis of porcine deltacoronaviruses in southern China Shao-Lun Zhai1†, Wen-Kang Wei1†, Xiao-Peng Li1†, Xiao-Hui Wen1, Xia Zhou1, He Zhang1, Dian-Hong Lv1*, Feng Li2,3 and Dan Wang2* Abstract Background: Following the initial isolation of porcine deltacoronavirus (PDCoV) from pigs with diarrheal disease in the United States in 2014, the virus has been detected on swine farms in some provinces of China. To date, little is known about the molecular epidemiology of PDCoV in southern China where major swine production is operated. Results: To investigate the prevalence of PDCoV in this region and compare its activity to other enteric disease of swine caused by porcine epidemic diarrhea virus (PEDV), transmissible gastroenteritis coronavirus (TGEV), and porcine rotavirus group C (Rota C), 390 fecal samples were collected from swine of various ages from 15 swine farms with reported diarrhea. Fecal samples were tested by reverse transcription-PCR (RT-PCR) that targeted PDCoV, PEDV, TGEV, and Rota C, respectively. PDCoV was detected exclusively from nursing piglets with an overall prevalence of approximate 1.28 % (5/390), not in suckling and fattening piglets. Interestingly, all of PDCoV-positive samples were from 2015 rather than 2012–2014. Despite a low detection rate, PDCoV emerged in each province/region of southern China. In addition, compared to TGEV (1.54 %, 5/390) or Rota C (1.28 %, 6/390), there were highly detection rates of PEDV (22.6 %, 88/390) in those samples. Notably, all five PDCoV-positive piglets were co-infected by PEDV. Furthermore, phylogenetic analysis of spike (S) and nucleocapsid (N) gene sequences of PDCoVs revealed that currently circulating PDCoVs in southern China were more closely related to other Chinese strains of PDCoVs than to those reported in United States, South Korea and Thailand. Conclusions: This study demonstrated that PDCoV was present in southern China despite the low prevalence, and supported an evolutionary theory of geographical clustering of PDCoVs. Keywords: Porcine deltacoronavirus, Occurrence, Spike gene, Nucleocapsid gene, Sequence analysis, Southern China Background (PEDV), transmissible gastroenteritis virus (TGEV), and Before 2012, the subfamily Coronavirinae included three porcine respiratory coronavirus (PRCV) belong to the genus genera (Alphacoronavirus, Betacoronavirus and Gamma- Alphacoronavirus; meanwhile, porcine hemagglutinating en- coronavirus). However, in 2012, an emerging genus, Delta- cephalomyelitis virus (PHEV) and Porcine deltacoronavirus coronavirus, was found in many animal species including (PDCoV) are assigned to the genus Betacoronavirus and swine from Hong Kong [1]. At present, more than five the genus Deltacoronavirus, respectively [1]. Numerous different coronaviruses have been described in swine pop- studies have shown that more than half of porcine corona- ulations. Among them, porcine epidemic diarrhea virus viruses (including PDCoV) were enteropathogenic and caused acute diarrhea and vomiting in pigs, which resulted * Correspondence: [email protected]; [email protected] – † in huge economic losses for the global swine industry [2 6]. Equal contributors Currently, PDCoV has been reported in Hong Kong, 1Animal Disease Diagnostic Center, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangdong Key Laboratory of Animal North America, Mexico, South Korea, Thailand and some Disease Prevention, Guangdong Open Laboratory of Veterinary Public Health, provinces of China [1, 7–19]. Despite recent progress, Guangzhou 510640, China little is known about the prevalence and epidemiology of 2Department of Biology and Microbiology, South Dakota State University, Brookings, SD 57007, USA PDCoV in southern China (including Guangdong Full list of author information is available at the end of the article © 2016 The Author(s). Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Zhai et al. Virology Journal (2016) 13:136 Page 2 of 11 province, Hainan province, and Guangxi autonomous previously published methods [8]. For amplification of the region), where major swine production is operated. full-length S and N genes, previously reported RT-PCR Therefore, the aim of this study was to investigate the primers (PDCoV-SF2: 5’-AGCGTTGACACCAACCTA prevalence and sequence properties of PDCoV in this TT-3’ and PDCoV-SR2: 5’-TCGTCGACTACCATTCCT region. TAAAC-3’; PDCoV-NF1 : 5’-CCATC GCTCCAAG TC ATTCT-3’ and PDCoV-NR1: 5’-TGGGTGGGTTTAA Methods CAGACATAG-3’) were used. PCR was carried out at Sampling 50 °C 30 min and 95 °C for 5 min, followed by 40 cycles A total of 390 fecal samples (Table 1) were collected of 98 °C for 10 s, 55 °C for 15 s, and 68 °C for 5 and 2 min from 15 commercial swine farms with reported diarrhea for S and N genes, respectively; final extension was per- in southern China. Farms A, D, E, J-O were from formed at 68 °C for 15 min. Positive amplicons were Guangdong province, Farms B, F, G were from Hainan cloned into the pGM-19 T vector (Tiangen Inc. Beijing). province, and farms C, H, I were the Guangxi autono- Furthermore, all positive recombinant plasmids were sub- mous region. Farms A-I derived 30 samples with the mitted to a sequencing company (The Beijing Genomics following arrangement: ten samples from suckling Institute, BGI) and sequenced at least three times. Five S piglets (<3 weeks old), ten samples from nursing piglets gene sequences and five N gene sequences were obtained (between 3 and 9 weeks old), and ten samples from (Additional file 1: Table S1), and have been submitted fattening piglets (>9 weeks old). The samples of farms to GenBank database (accession numbers KU204694- A-I were collected between July and August 2015 and KU204701, KX534090-KX534091). stored at −80 °C until further use. However, the samples of farms J-O were archived samples from 2012 to 2014. Phylogenetic analysis of the S and N genes Prior to viral RNA extraction, fecal samples were diluted Sequence alignment analysis was performed using the one time using Phosphate Buffered Saline (PBS) (pH: Clustal W program implemented in DNAStar software. A 7.4). The supernatants were then collected by centrifuga- phylogenetic tree was then constructed by the neighbor- tion at 5000 × g for 5 min. 200 μl of clarified superna- joining method using the Molecular Evolutionary Genetics tants was used to extract viral RNA following the Analysis (MEGA) software version 5.1 with 1000 bootstrap manufacturer’s recommendations (Axygen Scientific replications set at 1000. Moreover, the possible recombin- Inc.). RNA samples were stored at −80 °C until further ation event was evaluated in the S and N genes by recom- analysis. bination detection program (RDP) 3.34 software. Reverse transcription polymerase chain reaction (RT-PCR) Results detection PDCoV detection To detect PDCoV genome in collected fecal samples, A total of 390 pig fecal samples, collected from 15 swine the previously reported RT-PCR primers (41 F: 5’-TTT farms with reported diarrhea in southern China, were CAGGTGCTCAAAGCTCA-3’ and 735R: 5’-GCGAAA assessed for the presence of PDCoV and other viral en- AGCATTTCCTGAAC-3’) targeting the nucleocapsid teric pathogens (PEDV, TGEV, and Rota C) by RT-PCR. (N) gene with reaction conditions (50 °C for 30 min As summarized in Table 1, the PDCoV genome was de- and 95 °C for 15 min for the reverse transcription reac- tected in specimens from 4 of 15 swine farms. Interest- tion, followed by 40 cycles of PCR amplification at 95 °C ingly, the PDCoV genome was detected only in nursing for 15 s, 55 °C for 45 s, and 72 °C for 1 min, with a final piglets, and was absent in suckling piglets and fattening extension at 72 °C for 7 min) were used [15]. In addition, pigs. Although PDCoV was detected in each province/ molecular detection of the three diarrhea-related enteric region of southern China, its overall prevalence in the viruses (Porcine epidemic diarrhea virus, PEDV; Porcine investigated pigs of various age groups (n =390) was transmissible gastroenteritis virus, TGEV; Porcine rota- relatively low (5/390, 1.28 %). The positive rate could be virus group C, Rota C) was performed in accordance with higher if only nursing piglets were included (5/150, previous methods [20–22] for further evaluation of the 3.33 %). In contrast, the prevalence of PEDV, another por- possible co-infection status with PDCoV in investigated cine coronavirus causing epidemic diarrhea, was relatively pig samples. higher (22.6 %, 88/390). In addition, PEDV was different from PDCoV in that it distributed similarly between nurs- Amplification of the spike (S) and N genes ing (36/150, 24 %) and suckling piglets (47/150, 31.3 %). To perform in-depth sequence comparison and phylogen- Five fattening pigs from farms A, D, F and I were also etic analysis with known reference sequences (Additional tested positive for the PEDV genome. We also examined file 1: Table S1), the
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